First Name:

Last Name:

School:

1. The formation of a solution can be explained using the equation G° = H° - TS°. Answer the following questions;

a) When two components are mixed and form a homogeneous mixture, the solution process is thermodynamically favored. What is the sign of G° when two components form a homogeneous mixture?

b) What sign of H° for the solution process, when two components form a homogeneous mixture, supports thermodynamic favorability?

c) What sign of S° for the solution process, when two components form a homogeneous mixture, supports thermodynamic favorability?

The enthalpy term, H°, for the solution process is represented in the Figure below;

2. Using the information in the Figure above answer the following questions;

a) Is energy released or absorbed to separate the solvent particles in Step 1?

b) Is energy released or absorbed to separate the solute particles in Step 2?

c) Is energy released or absorbed when solute particles and solvent particles mix together in Step 3?

3. The sum of the energy required in Step1, Step 2 and Step 3 equals the H°, for the solution process. Mathematically this is expressed as H°_{Step 1} + H°_{Step 2} + H°_{Step 3} = H°_{solution process}

What must be true about H°_{Step 3} compared to H°_{Step 1} + H°_{Step 2} for the solution process to be negative, favoring the solution process?

4. Based on the above Figure, in which are particles more dispersed (more positional microstates/greater randomness/greater dissorder) a solute and solvent before mixing, or a homogeneous mixture of that solute and solvent?

Explain

5. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

6. If there is one question you would like to have answered in lecture, what would that question be?